Conversion circuit with a capacitor module, balancing module and a startup module and related electronic device

Abstract

A conversion circuit includes a capacitor module, a balancing module, and a startup module. The capacitor module includes at least a first capacitor and a second capacitor. The balancing module includes at least a first resonant circuit. The startup module includes a direct current-direct current converter and a target capacitor. The first resonant circuit includes at least two groups of switches and a first resonant cavity. The first capacitor is connected in series to the second capacitor, and connected in parallel to the target capacitor. The first resonant circuit is separately connected to both ends of the first capacitor and the second capacitor by using the startup module. The balancing module balances voltages at both ends of the first capacitor and the second capacitor by controlling the switches in the first resonant circuit. The startup module is configured to start the balancing module and the capacitor module.

What is claimed is: 
     
         1 . A conversion circuit comprising:
 a capacitor module, wherein the capacitor module comprises at least a first capacitor and a second capacitor;   a balancing module, wherein the balancing module comprises at least a first resonant circuit; and   a startup module, wherein the startup module comprises a direct current-direct current converter separately coupled to both ends of a target capacitor, the first resonant circuit comprises at least two groups of switches connected in parallel to each other and a first resonant cavity connected between the two groups of switches, the first capacitor is connected in series to the second capacitor, and the first capacitor is connected in parallel to the target capacitor, the first resonant circuit is separately connected to both ends of the target capacitor and the second capacitor, the balancing module is configured to balance voltages at both ends of the first capacitor and the second capacitor by controlling the switches in the first resonant circuit in conjunction with influence of the first resonant cavity on a current, the startup module is configured to start the balancing module and the capacitor module;   wherein one group of switches in the two groups of switches in the first resonant circuit further comprises: at least a first switch and a third switch, the other group of switches in the two groups of switches in the first resonant circuit further comprises: at least a second switch and a fourth switch, the first switch and the third switch are not simultaneously turned on, and the second switch and the fourth switch are not simultaneously turned on; and   wherein the first switch is connected in series to the third switch, and the second switch is connected in series to the fourth switch; one end of the second capacitor is connected to a first end of the second switch, and the other end of the second capacitor is separately connected to a first end of the first switch, a first end of the direct current-direct current converter, and one end of the first capacitor; a second end of the direct current-direct current converter is separately connected to one end of the target capacitor and a second end of the fourth switch; the other end of the first capacitor is connected to a third end of the direct current-direct current converter; and a fourth end of the direct current-direct current converter is separately connected to a second end of the third switch and the other end of the target capacitor.   
     
     
         2 . The conversion circuit according to  claim 1 , wherein the first resonant cavity further comprises:
 at least a first resonant capacitor and a first resonant inductor, one end of the first resonant cavity is separately connected to a second end of the first switch and a first end of the third switch, and the other end of the first resonant cavity is separately connected to a second end of the second switch and a first end of the fourth switch.   
     
     
         3 . The conversion circuit according to  claim 1 , wherein the capacitor module further comprises:
 a third capacitor, the balancing module further comprises:   a second resonant circuit comprising at least two groups of switches connected in parallel to each other and a second resonant cavity connected between the two groups of switches;   one group of switches in the two groups of switches in the second resonant circuit comprises at least a fifth switch and a seventh switch, the other group of switches in the two groups of switches in the second resonant circuit comprises at least a sixth switch and an eighth switch, and the second resonant cavity comprises at least a second resonant capacitor and a second resonant inductor;   the second resonant circuit is separately connected to both ends of the target capacitor and the third capacitor;   the balancing module is configured to balance voltages at both ends of the first capacitor and the third capacitor by controlling the switches in the second resonant circuit in conjunction with influence of the second resonant cavity on a current; and   the fifth switch and the seventh switch are not simultaneously turned on, and the sixth switch and the eighth switch are not simultaneously turned on.   
     
     
         4 . The conversion circuit according to  claim 1 , wherein the balancing module further comprises:
 a second resonant circuit comprising at least two groups of switches connected in parallel to each other and a second resonant cavity connected between the two groups of switches;   one group of switches in the two groups of switches in the second resonant circuit comprises at least a fifth switch and a seventh switch, the other group of switches in the two groups of switches in the second resonant circuit comprises at least a sixth switch and an eighth switch, and the second resonant cavity comprises at least a second resonant capacitor and a second resonant inductor;   the balancing module is configured to balance voltages at both ends of the first capacitor and the second resonant capacitor by controlling the switches in the second resonant circuit in conjunction with influence of the second resonant cavity on a current; and   the fifth switch and the seventh switch are not simultaneously turned on, and the sixth switch and the eighth switch are not simultaneously turned on.   
     
     
         5 . The conversion circuit according to  claim 3 , wherein the first resonant capacitor is connected in series to the first resonant inductor, and the second resonant capacitor is connected in series to the second resonant inductor;
 the first capacitor, the second capacitor, and the third capacitor are sequentially connected in series;   one end of the third capacitor is connected to a first end of the sixth switch, and the other end of the third capacitor is separately connected to a first end of the fifth switch, the first end of the second switch, and one end of the second capacitor; the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, and a second end of the eighth switch; the other end of the first capacitor is connected to the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, and a second end of the seventh switch;   the first switch is connected in series to the third switch, the second switch is connected in series to the fourth switch, one end of the first resonant cavity is separately connected to the second end of the first switch and the first end of the third switch, and the other end of the first resonant cavity is separately connected to the second end of the second switch and the first end of the fourth switch; and   the fifth switch is connected in series to the seventh switch, the sixth switch is connected in series to the eighth switch, one end of the second resonant cavity is separately connected to a second end of the fifth switch and a first end of the seventh switch, and the other end of the second resonant cavity is separately connected to a second end of the sixth switch and a first end of the eighth switch.   
     
     
         6 . The conversion circuit according to  claim 4 , wherein the capacitor module further comprises:
 a third capacitor, the first resonant capacitor is connected in series to the first resonant inductor, and the second resonant capacitor is connected in series to the second resonant inductor;   a first end of the sixth switch is connected to one end of the third capacitor; the fifth switch is separately connected to one end of the second capacitor and the first end of the second switch; the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, and a second end of the eighth switch; the other end of the first capacitor is separately connected to the other end of the third capacitor and the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, and a second end of the seventh switch;   the first switch is connected in series to the third switch, the second switch is connected in series to the fourth switch, one end of the first resonant cavity is separately connected to the second end of the first switch and the first end of the third switch, and the other end of the first resonant cavity is separately connected to the second end of the second switch and the first end of the fourth switch; and   the fifth switch is connected in series to the seventh switch, the sixth switch is connected in series to the eighth switch, one end of the second resonant cavity is separately connected to a second end of the fifth switch and a first end of the seventh switch, and the other end of the second resonant cavity is separately connected to a second end of the sixth switch and a first end of the eighth switch.   
     
     
         7 . The conversion circuit according to  claim 4 , wherein the conversion circuit further comprises:
 a direct current power supply, the first resonant capacitor is connected in series to the first resonant inductor, and the second resonant capacitor is connected in series to the second resonant inductor;   a first end of the sixth switch is connected to one end of the direct current power supply; the fifth switch is separately connected to one end of the second capacitor and the first end of the second switch; the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, and a second end of the eighth switch; the other end of the first capacitor is separately connected to the other end of the direct current power supply and the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, and a second end of the seventh switch;   the first switch is connected in series to the third switch, the second switch is connected in series to the fourth switch, one end of the first resonant cavity is separately connected to the second end of the first switch and the first end of the third switch, and the other end of the first resonant cavity is separately connected to the second end of the second switch and the first end of the fourth switch; and   the fifth switch is connected in series to the seventh switch, the sixth switch is connected in series to the eighth switch, one end of the second resonant cavity is separately connected to a second end of the fifth switch and a first end of the seventh switch, and the other end of the second resonant cavity is separately connected to a second end of the sixth switch and a first end of the eighth switch.   
     
     
         8 . The conversion circuit according to  claim 5 , wherein the capacitor module further comprises:
 a fourth capacitor, the balancing module further comprises:   a third resonant circuit comprising at least two groups of switches connected in parallel to each other and a third resonant cavity connected between the two groups of switches;   one group of switches in the two groups of switches in the third resonant circuit comprises at least a ninth switch and an eleventh switch, the other group of switches in the two groups of switches in the third resonant circuit comprises at least a tenth switch and a twelfth switch, and the third resonant cavity comprises at least a third resonant capacitor and a third resonant inductor;   the third resonant circuit is separately connected to both ends of the target capacitor and the fourth capacitor;   the balancing module is configured to balance voltages at both ends of the first capacitor and the fourth capacitor by controlling the switches in the third resonant circuit in conjunction with influence of the third resonant cavity on a current; and   the ninth switch and the eleventh switch are not simultaneously turned on, and the tenth switch and the twelfth switch are not simultaneously turned on.   
     
     
         9 . The method according to  claim 5 , wherein the balancing module further comprises:
 a third resonant circuit comprising at least two groups of switches connected in parallel to each other and a third resonant cavity connected between the two groups of switches;   one group of switches in the two groups of switches in the third resonant circuit comprises at least a ninth switch and an eleventh switch, the other group of switches in the two groups of switches in the third resonant circuit comprises at least a tenth switch and a twelfth switch, and the third resonant cavity comprises at least a third resonant capacitor and a third resonant inductor;   the balancing module is configured to balance voltages at both ends of the first capacitor and the third resonant capacitor by controlling the switches in the third resonant circuit in conjunction with influence of the third resonant cavity on a current; and   the ninth switch and the eleventh switch are not simultaneously turned on, and the tenth switch and the twelfth switch are not simultaneously turned on.   
     
     
         10 . The conversion circuit according to  claim 8 , wherein the third resonant capacitor is connected in series to the third resonant inductor, and the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are sequentially connected in series;
 one end of the fourth capacitor is connected to a first end of the tenth switch, and the other end of the fourth capacitor is separately connected to a first end of the ninth switch, the first end of the sixth switch, and one end of the third capacitor; the other end of the third capacitor is separately connected to the first end of the fifth switch, the first end of the second switch, and one end of the second capacitor; the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, the second end of the eighth switch, and a second end of the twelfth switch; the other end of the first capacitor is connected to the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, the second end of the seventh switch, and a second end of the eleventh switch; and   the ninth switch is connected in series to the eleventh switch, the tenth switch is connected in series to the twelfth switch, one end of the third resonant cavity is separately connected to a second end of the ninth switch and a first end of the eleventh switch, and the other end of the third resonant cavity is separately connected to a second end of the tenth switch and a first end of the twelfth switch.   
     
     
         11 . The conversion circuit according to  claim 9 , wherein the capacitor module further comprises:
 a fourth capacitor, and the third resonant capacitor is connected in series to the third resonant inductor;   a first end of the tenth switch is connected to one end of the fourth capacitor, the ninth switch is separately connected to the first end of the sixth switch and one end of the third capacitor, and the other end of the third capacitor is separately connected to the first end of the fifth switch, the first end of the second switch, and one end of the second capacitor;   the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, the second end of the eighth switch, and a second end of the twelfth switch; the other end of the first capacitor is separately connected to the other end of the fourth capacitor and the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, the second end of the seventh switch, and a second end of the eleventh switch; and   the ninth switch is connected in series to the eleventh switch, the tenth switch is connected in series to the twelfth switch, one end of the third resonant cavity is separately connected to a second end of the ninth switch and a first end of the eleventh switch, and the other end of the third resonant cavity is separately connected to a second end of the tenth switch and a first end of the twelfth switch.   
     
     
         12 . The conversion circuit according to  claim 9 , wherein the conversion circuit further comprises:
 a direct current power supply, and the third resonant capacitor is connected in series to the third resonant inductor;   a first end of the tenth switch is connected to one end of the direct current power supply, the ninth switch is separately connected to the first end of the sixth switch and one end of the third capacitor, and the other end of the third capacitor is separately connected to the first end of the fifth switch, the first end of the second switch, and one end of the second capacitor;   the other end of the second capacitor is separately connected to the first end of the first switch, one end of the first capacitor, and the first end of the direct current-direct current converter; the second end of the direct current-direct current converter is separately connected to one end of the target capacitor, the second end of the fourth switch, the second end of the eighth switch, and a second end of the twelfth switch; the other end of the first capacitor is separately connected to the other end of the direct current power supply and the third end of the direct current-direct current converter; and the fourth end of the direct current-direct current converter is separately connected to the other end of the target capacitor, the second end of the third switch, the second end of the seventh switch, and a second end of the eleventh switch; and   the ninth switch is connected in series to the eleventh switch, the tenth switch is connected in series to the twelfth switch, one end of the third resonant cavity is separately connected to a second end of the ninth switch and a first end of the eleventh switch, and the other end of the third resonant cavity is separately connected to a second end of the tenth switch and a first end of the twelfth switch.   
     
     
         13 . The conversion circuit according to  claim 1 , wherein a voltage at both ends of the target capacitor is an output voltage, and a voltage at both ends of the capacitor module is an input voltage; or,
 wherein a voltage at both ends of the target capacitor is an input voltage, and a voltage at both ends of the capacitor module is an output voltage.   
     
     
         14 . The conversion circuit according to  claim 1 , wherein the switch is an insulated gate bipolar transistor (IGBT). 
     
     
         15 . The conversion circuit according to  claim 1 , wherein the switch is an N-channel enhanced insulated gate field-effect transistor (NMOS). 
     
     
         16 . The conversion circuit according to  claim 1 , wherein the first switch and the third switch are diodes, and the second switch and the fourth switch are N-channel enhanced insulated gate field-effect transistors NMOSs. 
     
     
         17 . The conversion circuit according to  claim 3 , wherein the first switch, the third switch, the fifth switch, and the seventh switch are diodes, and the second switch, the fourth switch, the sixth switch, and the eighth switch are N-channel enhanced insulated gate field-effect transistors NMOSs. 
     
     
         18 . The conversion circuit according to  claim 1 , wherein the direct current-direct current converter further comprises:
 a first startup switch,   a second startup switch, and   a startup inductor.